Community speed watch groups have been set up in 12 areas of Wiltshire.
The police-trained volunteers use handheld devices to monitor traffic at pre-determined locations where speeding issues have been identified.
Information gathered by the groups about motorists suspected to be breaking the limit is passed on to police officers.
Warning letters are then sent to the vehicle's owner and persistent offenders are investigated by police.
Where the results show a persistent speed problem, groups may approach the Wiltshire and Swindon road safety partnership for further investigation of the site.
The speed watch volunteers are currently operating in Enford, Dauntsey Green, Charlton, Woodfalls, Rushall, Upavon, Devizes, Amesbury, Bratton, Durrington, Bulford and Edington.
Any other areas with a speed problem and want to set up a group should apply through their neighbourhood policing team.
Community speed watch is a partnership with Wiltshire Police, Wiltshire Council's Highway's department and local residents.